#include<stdio.h>
/*报错
int main()
{
    int n = 10;
    const int *p = &n;
    *p = 20;
    printf("%d\n", n);
    return 0;
}
*/
//成功改成20
int main()
{
    int n = 10;
    int * const p = &n;
    *p = 20;
    printf("%d\n", n);
    return 0;
}

/*

*/